<template>
	<div class="component-upload-image">
		<el-upload
			multiple
			:action="uploadImgUrl"
			list-type="picture-card"
			:on-success="handleUploadSuccess"
			:before-upload="handleBeforeUpload"
			:data="data"
			:limit="limit"
			:on-error="handleUploadError"
			:on-exceed="handleExceed"
			ref="imageUpload"
			:before-remove="handleDelete"
			:show-file-list="true"
			:headers="headers"
			:file-list="fileList"
			:on-preview="handlePictureCardPreview"
			:class="{ hide: fileList.length >= limit }"
		>
			<el-icon class="avatar-uploader-icon">
				<plus/>
			</el-icon>
		</el-upload>
		<!-- 上传提示 -->
		<div class="el-upload__tip" v-if="showTip">
			请上传
			<template v-if="fileSize">
				大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
			</template>
			<template v-if="fileType">
				格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
			</template>
			的文件
		</div>

		<el-dialog
			v-model="dialogVisible"
			title="预览"
			width="800px"
			append-to-body
		>
			<img
				:src="dialogImageUrl"
				style="display: block; max-width: 100%; margin: 0 auto"
			/>
		</el-dialog>
	</div>
</template>

<script setup>
import {getToken} from "@/utils/auth";
import {isExternal} from "@/utils/validate";

const props = defineProps({
	modelValue: [String, Object, Array],
	// 上传接口地址
	action: {
		type: String,
		default: "/common/upload"
	},
	// 上传携带的参数
	data: {
		type: Object
	},
	// 图片数量限制
	limit: {
		type: Number,
		default: 5,
	},
	// 大小限制(MB)
	fileSize: {
		type: Number,
		default: 5,
	},
	// 文件类型, 例如['png', 'jpg', 'jpeg']
	fileType: {
		type: Array,
		default: () => ["png", "jpg", "jpeg"],
	},
	// 是否显示提示
	isShowTip: {
		type: Boolean,
		default: true
	},
});

const {proxy} = getCurrentInstance();
const emit = defineEmits();
const number = ref(0);
const uploadList = ref([]);
const dialogImageUrl = ref("");
const dialogVisible = ref(false);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(import.meta.env.VITE_APP_BASE_API + props.action); // 上传的图片服务器地址
const headers = ref({Authorization: "Bearer " + getToken()});
const fileList = ref([]);
const showTip = computed(
	() => props.isShowTip && (props.fileType || props.fileSize)
);

watch(() => props.modelValue, val => {
	if (val) {
		// 首先将值转为数组
		const list = Array.isArray(val) ? val : props.modelValue.split(",");
		// 然后将数组转为对象数组
		fileList.value = list.map(item => {
			if (typeof item === "string") {
				if (item.indexOf(baseUrl) === -1 && !isExternal(item)) {
					item = {name: baseUrl + item, url: baseUrl + item};
				} else {
					item = {name: item, url: item};
				}
			}
			return item;
		});
	} else {
		fileList.value = [];
		return [];
	}
}, {deep: true, immediate: true});

// 上传前loading加载
function handleBeforeUpload(file) {
	let isImg = false;
	if (props.fileType.length) {
		let fileExtension = "";
		if (file.name.lastIndexOf(".") > -1) {
			fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
		}
		isImg = props.fileType.some(type => {
			if (file.type.indexOf(type) > -1) return true;
			if (fileExtension && fileExtension.indexOf(type) > -1) return true;
			return false;
		});
	} else {
		isImg = file.type.indexOf("image") > -1;
	}
	if (!isImg) {
		proxy.$modal.msgError(`文件格式不正确，请上传${props.fileType.join("/")}图片格式文件!`);
		return false;
	}
	if (file.name.includes(',')) {
		proxy.$modal.msgError('文件名不正确，不能包含英文逗号!');
		return false;
	}
	if (props.fileSize) {
		const isLt = file.size / 1024 / 1024 < props.fileSize;
		if (!isLt) {
			proxy.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
			return false;
		}
	}
	proxy.$modal.loading("正在上传图片，请稍候...");
	number.value++;
}

// 文件个数超出
function handleExceed() {
	proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传成功回调
function handleUploadSuccess(res, file) {
	if (res.code === 200) {
		uploadList.value.push({name: res.fileName, url: res.fileName});
		uploadedSuccessfully();
	} else {
		number.value--;
		proxy.$modal.closeLoading();
		proxy.$modal.msgError(res.msg);
		proxy.$refs.imageUpload.handleRemove(file);
		uploadedSuccessfully();
	}
}

// 删除图片
function handleDelete(file) {
	const findex = fileList.value.map(f => f.name).indexOf(file.name);
	if (findex > -1 && uploadList.value.length === number.value) {
		fileList.value.splice(findex, 1);
		emit("update:modelValue", listToString(fileList.value));
		return false;
	}
}

// 上传结束处理
function uploadedSuccessfully() {
	if (number.value > 0 && uploadList.value.length === number.value) {
		fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
		uploadList.value = [];
		number.value = 0;
		emit("update:modelValue", listToString(fileList.value));
		proxy.$modal.closeLoading();
	}
}

// 上传失败
function handleUploadError() {
	proxy.$modal.msgError("上传图片失败");
	proxy.$modal.closeLoading();
}

// 预览
function handlePictureCardPreview(file) {
	dialogImageUrl.value = file.url;
	dialogVisible.value = true;
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
	let strs = "";
	separator = separator || ",";
	for (let i in list) {
		if (undefined !== list[i].url && list[i].url.indexOf("blob:") !== 0) {
			strs += list[i].url.replace(baseUrl, "") + separator;
		}
	}
	return strs != "" ? strs.substr(0, strs.length - 1) : "";
}
</script>

<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
	display: none;
}
</style>